I have three, for example.
One thing you can do, to help boost their traffic levels and search engine rankings, is crosslink them.
What I mean by crosslinking, is linking one blog to another as you would link any other blog or static website.
If you also have a traditional static website, be certain to crosslink it with your blogs too.
There is some thought that Google might not like crosslinking. That is not really a problem for blogs. I have crosslinked my three blogs, with very beneficial results.
There are some tremendous advantages from crosslinking.
First of all, you will gain extra traffic. Readers of your Blog A might also be interested in what you are writing on Blog B.
Google (and the other major search engines) value the number of incoming links. The added links add to your backlink total.
The search engines also value quality of backlinks. Because you write the anchor text leading from one of your blogs to another, you can control the quality of link text.
Link text, also called anchor text, is the keyword phrase you place on the clickable link. In most cases, it's the blog title. You can change it to "cat photos" or "Chicago Bulls news blog" or anything you want. The search engines value anchor link text very highly.
You can also boost the link power of your crosslinks by "theming" your blog posts to make your blogs "similar" in theme content. By writing a post in one blog about the other blog's topic, they become essentially themed the same way in the eyes of the search engines.
As you can see, there are many reasons to link your blogs and websites to one another.
Simply make them cover the same "topic".
You'll get double the bang for the buck.
